NA 4908 bearing dimensions & suffix variants
Look up recorded dimensions for designations beginning with NA 4908. The table retains complete manufacturer designations so special suffixes and different dimensional variants remain visible.
On this page5 sections ⌄
Find by measured dimensions
Enter bore d, outside diameter D and width B. Use decimals or inch fractions such as 1/2 or 1 1/4.
NA 4908 dimensions and recorded technical data
The recorded NA 4908 base designation measures 40×62×22 mm (inside diameter d × outside diameter D × width B). This answer uses unsuffixed records from SKF. It does not assign the same dimensions or operating ratings to every suffix.
The numeric series boundary is preserved: a longer number is not included merely because its first digits match. 14 recorded variants are listed. A dash means the value is missing, not zero.
Read the original dimensions for NA 4908
Boundary size alone does not describe every ring, shoulder or assembled unit. These tables retain the recorded manufacturer labels, symbols, units and limits for each complete marking. Expand a record to check its detailed measurements.
Important: an approximate value, a minimum or a maximum keeps that qualifier. These reference extracts are not CAD drawings, fit recommendations or replacement approvals.
SKF NA 4908 — 9 dimension fields
Single row needle roller bearing with machined rings, with flanges. Source: SKF product catalogue; recorded snapshot 2026-09-02.
Use the complete designation shown here. A seal, cage, clearance or precision suffix can matter even when nominal boundary dimensions match.
Minimum and maximum mounting dimensions are limits, not nominal bearing dimensions. Check shaft/housing shoulders and fillets against the current drawing before designing a seat.
Bearing and component measurements
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 40 mm |
| Outside diameter | D | 62 mm |
| Width | B | 22 mm |
| Raceway diameter inner ring | F | 48 mm |
| Chamfer dimension outer ring | r 1,2 | min. 0.6 mm |
| Permissible axial displacement from the normal position of one bearing ring relative to the other | s | max. 1 mm |
Mounting limits and abutments
| Measurement | Source symbol | Recorded value |
|---|---|---|
| Smallest permissible abutment diameter shaft, bearings with flanges | d a | min. 44 mm |
| Diameter of housing abutment | D a | max. 58 mm |
| Fillet radius | r a | max. 0.6 mm |
Catalogue parameters for NA 4908
Choose the complete brand and marking before reading a value. These source-labelled records add dimensions, construction and engineering properties where they were recorded; a shared model number does not establish interchangeability.
Units, ranges and minimum/maximum qualifiers are retained. The data is a dated catalogue reference, not a certified drawing, a complete current specification or an operating approval.
SKF NA 4908 — 37 recorded parameters
Single row needle roller bearing with machined rings, with flanges
Reference: SKF product catalogue; source snapshot 2026-09-02.
This can be a unit or housing record. Bolt spacing, housing envelope, centre height and the insert identity need separate checks; do not interpret every outside dimension as bearing D.
Values shown are retained from the recorded source. Zero boundary dimensions and zero load ratings from incomplete legacy feeds are withheld rather than presented as usable specifications.
Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | Not separately recorded | 40.0 mm |
| Outside diameter | Not separately recorded | 62.0 mm |
| Width | Not separately recorded | 22.0 mm |
Performance
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Basic dynamic load rating | Not separately recorded | 50.0 kN |
| Basic static load rating | Not separately recorded | 71.0 kN |
| Reference speed | Not separately recorded | 8000.0 r/min |
| Limiting speed | Not separately recorded | 9500.0 r/min |
| SKF performance class | Not separately recorded | SKF Explorer |
Properties
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bearing part | Not separately recorded | Complete bearing |
| Number of rows | Not separately recorded | 1 |
| Outer ring type | Not separately recorded | Machined (solid) |
| Aligning feature | Not separately recorded | Without |
| Cage | Not separately recorded | Sheet metal |
| Number of flanges, outer ring | Not separately recorded | 2 |
| Radial internal clearance | Not separately recorded | CN |
| Tolerance class | Not separately recorded | Normal |
| Material, bearing | Not separately recorded | Bearing steel |
| Coating | Not separately recorded | Without |
| Sealing | Not separately recorded | Without |
| Relubrication feature | Not separately recorded | With |
| Indicative carbon footprint for new product | Not separately recorded | 0.85 kg CO 2 e |
Logistics
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Product net weight | Not separately recorded | 0.23 kg |
Engineering — Dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Bore diameter | d | 40 mm |
| Outside diameter | D | 62 mm |
| Width | B | 22 mm |
| Raceway diameter inner ring | F | 48 mm |
| Chamfer dimension outer ring | r 1,2 | min. 0.6 mm |
| Permissible axial displacement from the normal position of one bearing ring relative to the other | s | max. 1 mm |
Engineering — Abutment dimensions
| Parameter | Source symbol | Recorded value |
|---|---|---|
| Smallest permissible abutment diameter shaft, bearings with flanges | d a | min. 44 mm |
| Diameter of housing abutment | D a | max. 58 mm |
| Fillet radius | r a | max. 0.6 mm |
Engineering — Calculation data
| Parameter | Source symbol | Recorded value |
|---|---|---|
| SKF performance class | Not separately recorded | SKF Explorer |
| Basic dynamic load rating | C | 50 kN |
| Basic static load rating | C 0 | 71 kN |
| Fatigue load limit | P u | 9 kN |
| Reference speed | Not separately recorded | 8000 r/min |
| Limiting speed | Not separately recorded | 9500 r/min |
No recorded variant matches these filters. Clear a filter to see other records; no substitute has been inferred.
| Brand / full designation | Named dimensions (mm / in) | Dynamic C (kN) | Static C0 (kN) | Reference speed (rpm) | Limiting speed (rpm) | Mass (kg / g) |
|---|---|---|---|---|---|---|
| SKFNA 4908Single row needle roller bearing with machined rings, with flanges |
| 50 kN | 71 kN | 8000 rpm | 9500 rpm | 0.23 kg230 g |
| IKONA4908Needle roller bearing |
| 41.6 kN | 67.4 kN | 5100 rpm | 8500 rpm | 0.244758 kg244.758 g |
| SKFNA 4908.2RSSingle row needle roller bearing with machined rings, with flanges and integral sealing |
| 42.5 kN | 58.5 kN | 8000 rpm | 4000 rpm | 0.241 kg241 g |
| SKFNA 4908 RSSingle row needle roller bearing with machined rings, with flanges and integral sealing |
| 42.5 kN | 58.5 kN | 8000 rpm | 4000 rpm | 0.252 kg252 g |
| INANA4908-2RSR-RR-XLNeedle roller bearing |
| 41 kN | 53 kN | — | — | 0.23952 kg239.52 g |
| INANA4908-2RSR-XLNeedle roller bearing |
| 41 kN | 53 kN | — | — | 0.23776 kg237.76 g |
| INANA4908-2RSR-XL-C2Needle roller bearing |
| 41 kN | 53 kN | — | — | 0.23776 kg237.76 g |
| INANA4908-2RSR-XL-C3Needle roller bearing |
| 41 kN | 53 kN | — | — | 0.23776 kg237.76 g |
| INANA4908-RSR-XLNeedle roller bearing |
| 41 kN | 53 kN | — | — | 0.23556 kg235.56 g |
| INANA4908-XLNeedle roller bearing |
| 48.5 kN | 67 kN | 5000 rpm | 9200 rpm | 0.234 kg234 g |
| INANA4908-XL-C2Needle roller bearing |
| 48.5 kN | 67 kN | 5000 rpm | 9200 rpm | 0.23 kg230 g |
| INANA4908-XL-C3Needle roller bearing |
| 48.5 kN | 67 kN | 5000 rpm | 9200 rpm | 0.23422 kg234.22 g |
| INANA4908-XL-C4Needle roller bearing |
| 48.5 kN | 67 kN | 5000 rpm | 9200 rpm | 0.23 kg230 g |
| IKONA4908UUNeedle roller bearing |
| 37.2 kN | 58.4 kN | 4000 rpm | — | 0.244758 kg244.758 g |
Compare recorded seals, clearance, precision and materials
Manufacturer wording is retained. A missing property is not inferred from another brand or a similar suffix.
| Brand / designation | Closure | Original precision | Clearance | Cage | Material | Lubricant |
|---|---|---|---|---|---|---|
| SKF NA 4908 | Without | Not recorded | CN | Sheet metal | Bearing steel | None |
| IKO NA4908 | Not recorded | JIS, Class 0 | Not recorded | Steel | High Carbon Chrome Steel | Not recorded |
| SKF NA 4908.2RS | Seal on both sides | Not recorded | CN | Sheet metal | Bearing steel | Grease |
| SKF NA 4908 RS | Seal on one side | Not recorded | CN | Sheet metal | Bearing steel | Grease |
| INA NA4908-2RSR-RR-XL | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-2RSR-XL | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-2RSR-XL-C2 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-2RSR-XL-C3 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-RSR-XL | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-XL | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-XL-C2 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-XL-C3 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| INA NA4908-XL-C4 | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded | Not recorded |
| IKO NA4908UU | Not recorded | JIS, Class 0 | Not recorded | Steel | High Carbon Chrome Steel | Not recorded |
How to compare these values
- Use the displayed dimension names and original symbols. Housing length L, height H2 and flange width are not bearing outside diameter D. A catalogue width with an unverified symbol must not be assumed to be inner-ring width B or assembly width T. Open the product record for mounting dimensions and geometry.
- Inch values are calculated from the recorded millimetres using 25.4 mm per inch, rounded to six decimal places. They do not change a metric bearing into an inch-series bearing. Gram values are converted from the recorded mass in kilograms.
- C and C0 describe different rating conditions. They are not a single safe working-load limit and cannot replace an application load calculation.
- Reference and limiting speeds are separate catalogue values. The source grease/oil context is shown where recorded. Lubricant, seals, loads, fit, clearance and cooling affect the usable operating speed.
- A common base number does not prove equivalent seals, clearance, precision, material or interchangeability. Open the full designation for these fields.
Related prefix matches — other model numbers may appear
These discovery results can contain a longer number or a different component. They are not specifications for the requested exact model. Open the complete product to inspect its original geometry.
NA4908
Needle roller bearing
View full technical record →SKFNA 4908
Single row needle roller bearing with machined rings, with flanges
View full technical record →SKFNA 4908.2RS
Single row needle roller bearing with machined rings, with flanges and integral sealing
View full technical record →INANA4908-2RSR-RR-XL
Needle roller bearing
View full technical record →INANA4908-2RSR-XL
Needle roller bearing
View full technical record →INANA4908-2RSR-XL-C2
Needle roller bearing
View full technical record →INANA4908-2RSR-XL-C3
Needle roller bearing
View full technical record →SKFNA 4908 RS
Single row needle roller bearing with machined rings, with flanges and integral sealing
View full technical record →INANA4908-RSR-XL
Needle roller bearing
View full technical record →IKONA4908UU
Needle roller bearing
View full technical record →INANA4908-XL
Needle roller bearing
View full technical record →INANA4908-XL-C2
Needle roller bearing
View full technical record →Check the drawing before substituting
Nominal dimensions are not shaft-fit tolerances. Different variants can add grooves, flanges, wider rings or assembly components. When the table has different dimensions, the complete designation—not the shared prefix—controls.
Reference basis & data limits
Manufacturer terminology is retained in the product records. Technical reference basis: JTEKT Basic Bearing Knowledge (boundary dimensions, tolerance classes and lubrication); NSK Bearing ABCs (lubrication, designations and clearance); NTN technical FAQs (closure codes and component interchange); SKF rolling-bearing selection and maintenance references.
Selection workflows and catalogue grouping are BearingScope editorial aids. Verify the current drawing and application requirements before using a candidate. Missing database information is not converted into an assumed match.